<template>
  <div class="upload-container">
    <!-- action是图片上传的接口地址 -->
    <!-- name是后端接收图片的属性 -->
    <el-upload
      :data="dataObj"
      :multiple="false"
      :show-file-list="false"
      :on-success="handleImageSuccess"
      :before-upload="beforeUpload"
      class="image-uploader"
      drag
      :action="$img.Imgupload"
      name="img"
      :headers="{ Authorization: token }"
    >
      <i class="el-icon-upload" />
      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
    </el-upload>
    <div class="image-preview">
      <div v-show="imageUrl.length > 1" class="image-preview-wrapper">
        <img :src="`${$img.ImgUrl}${imageUrl}`" />
        <div class="image-preview-action">
          <i class="el-icon-delete" @click="rmImage" />
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
export default {
  name: "SingleImageUpload",
  props: {
    value: {
      type: String,
      default: "",
    },
  },
  data() {
    return {
      tempUrl: "",
      dataObj: { token: "", key: "" },
    };
  },
  computed: {
    ...mapState("user", ["token"]),
    imageUrl() {
      return this.value;
    },
  },
  methods: {
    rmImage() {
      this.emitInput("");
    },
    emitInput(val) {
      this.$emit("input", val);
    },
    handleImageSuccess(res) {
      this.tempUrl = `${this.$img.ImgUrl}${res.data.img}`;
      this.emitInput(res.data.img);
    },
    beforeUpload(file) {
      console.log("上传之前", file);
      if (file.size / 1024 > 2048) {
        this.$message.error("图片不能超出2M");
        return false;
      }
    },
  },
};
</script>

<style lang="scss" scoped>
@import "~@/styles/mixin.scss";
.upload-container {
  width: 100%;
  position: relative;
  @include clearfix;
  .image-uploader {
    width: 60%;
    float: left;
  }
  .image-preview {
    width: 200px;
    height: 200px;
    position: relative;
    border: 1px dashed #d9d9d9;
    float: left;
    margin-left: 50px;
    .image-preview-wrapper {
      position: relative;
      width: 100%;
      height: 100%;
      img {
        width: 100%;
        height: 100%;
      }
    }
    .image-preview-action {
      position: absolute;
      width: 100%;
      height: 100%;
      left: 0;
      top: 0;
      cursor: default;
      text-align: center;
      color: #fff;
      opacity: 0;
      font-size: 20px;
      background-color: rgba(0, 0, 0, 0.5);
      transition: opacity 0.3s;
      cursor: pointer;
      text-align: center;
      line-height: 200px;
      .el-icon-delete {
        font-size: 36px;
      }
    }
    &:hover {
      .image-preview-action {
        opacity: 1;
      }
    }
  }
}
</style>
